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| Phase-difference-based simulation of spatial correlated and non-stationary seismic ground motions |
| Received:November 14, 2008 |
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| DOI：10.7511/jslx20105014 |
| KeyWord:simulation of ground motions phase difference spectrum phase derivation coherence function non-stationary characteristic |
| Author | Institution |
| 田玉基 |
北京交通大学 土木与建筑工程学院,北京 |
| 杨庆山 |
北京交通大学 土木与建筑工程学院,北京 |
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| Abstract: |
| The non-stationary characteristics of an earthquake ground motion are dependent on the phase difference spectrum, which is proportional to the phase derivatives. As viewed from the energy of acceleration time history, the time of PGA is related to the mean value of the phase derivatives while the duration of strong seismic ground motion is related to the variance of the phase derivatives. The empirical model of phase difference spectrum is introduced firstly into the simulation of spatial correlated and non-stationary ground motions. The simulated ground motions are expressed by the power spectra, coherence functions and random phase angles generated according to the empirical model of phase difference spectrum and are synthesized by discrete Fourier transform. |